DYNAMIC MECHANICAL PROPERTIES OF CANDIDATE ENGINE MOUNT MATERIALS

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Authors
  1. Champagne, M.F.
  2. Szabo, J.P.
  3. Utracki, L.A.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
The dynamic mechanical properties of eight elastomeric materials were compared with two standard materials, natural rubber and chloroprene, for use in engine mount applications. The eight elastomers were chlorosulfonated polyethylene, nitrile butadiene rubber, hydrogenated NBR, hydrogenated SEBS, plasticized polyvinylchloride, polyepichlorohydrin, polyolefin alloy, and polypropylene glycol. Master curves of storage modulus and loss factor were constructed from dynamic mechanical thermal analysis of the elastomeric specimens followed by time-temperature superposition of the data. The complex modulus data was used in conjunction with a single degree of freedom model (including wave effects - the so called "long rod model") to calculate the transmissibility of a typical submarine engine mount made from each of the materials. The study showed that many of the polymers investigated in this study are as good as conventional materials in isolating vibrations in the frequency range used for the calculations (0 - 10 kHz). At 100 Hz all the materials isolate very well, providing between 33-40 dB of isolation. Large differences were seen in the resistance to diesel fuel uptake for the ten elastomers. Natural rubber and chloroprene, two elastomers currently used on board Canadian Forces ships and submarines, absorbed significant amounts of fuel, 134.4% and 56.6%, respectively. TRUNCATED
Keywords
Vibration isolation;Dynamic mechanical analysis
Report Number
DREA-TM-96-242 — Technical Memorandum
Date of publication
01 Feb 1997
Number of Pages
65
DSTKIM No
97-02139
CANDIS No
502144
Format(s):
Hardcopy;Document Image stored on Optical Disk

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